Aedsojst



(No Model.)

W. H. RICHARDSON.

SMOKE BURNING ATTAGHMENT FOR STOVES, 850. No. 281,399. Patented Ju1y17, 1883.

UNITED." STATES PATENT OFFICE.

WILLIAM H. RICHARDSON, OF SAN FRANCISCO, CALIFORNIA.

SMOKE-BURNING ATTACHMENT FOR STOVES, 80c.

SPECIFICATION forming part of Letters Patent No. 281,399, dated July 17, 1883.

Application filed September 25,1882. (No model.)

To all whom it may concern Be it known that I, WILLIAM HENRY RICH- ARDSON, of the city and county of San Francisco, State of California, have invented an Improved Smoke-Burning Attachment for Stoves, Furnaces, &c.; and I hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to an attachment to stoves, furnaces, and radiators; and it consists of a chamber formed in the pipe, between the furnace and the chimney, and a supplemental pipe. leading therefrom to a point below the grate, and, in connection with these, of a damper or valve, whereby the products of combustion are returned to the body of stove, furnace, or radiators through the space below the grate-bars, to be exposed to the action of the fire again before finally escaping to the chimney, as will be more fully described, referencebeing had to the accompanying drawings, in which- Figure 1 is a vertical section of the furnace and pipes, with the valve closing the supplemental pipe. Fig. 2 is a section of afurnace, showing the supplemental pipe open.

Let A represent a stove or furnace constructed in the usual manner, with fire-place B, ash-pit O, and having pipe D, connecting with chimney E.

At any point in the length of the pipe D, between the furnace A and chimney E, I form a chamber, F, having openings f f at each end of it, connecting it with pipe D. This chamber contains a damper or valve, G, hinged at one end to the upper part of chamber F, and controlled by a toothed rack-bar or handlever, g, for holding it in any desired position.

H is a supplemental pipe, one end of which connects directly with the top of the chamber F by an opening, f, and the other end connects with the stove or furnace below the grate-bars, so that there will be a free communication between the ash-pit O and the chamber F.

' The operation of my apparatus will be as follows: The fire being started in the stove or furnace, the damper or valve G in the chamber F, is raised so as to close the opening f at top of the chamber F, leaving a free communication through the pipe D, between the furnace A and the chimney E. The ashpit door is opened, giving such draft as may be needed. After the fire is well kindled, the damper G is lowered, leaving a small space between the bottom of the chamber F and .the lower edge of damper G, as shown in Fig. 2. The ash-pit door being closed, the smoke and products of combustion will be directed into the pipe H. from the position of the valve G, and the cold air from the chimney, which meets it at this point, will cause it to return through the pipe H into the ash-pit 0, below the grate-bars, and from this point the unconsumed gases and products of combustion will pass up through the incandescent fuel, together with a fresh supply of air from the chimney E. This air is drawn down to the space'below the grate-bars to promote combustion by reason of the closing of all inlet-passages through which air might enter the ash-pit directly. A double current is thus produced withinthe chimney, one be ing an upward current of the heated products of combustion from the furnace, and the other a downward current of cold air, which enters the chamber F and passes through the pipe H to the space below the grate-bars, and those parts of smoke and gases that were not consumed in the first action will be again exposed to the action of the fire, thereby causing asaving of fuel.

I am aware it is not broadly new, in stoves and furnaces, to check products of combustion direct from the fire-pot in a chamber or otherwise, and return them beneath the fire-pot alone or mingled with air, and therefore I make no broad claim thereto, but confine my self to my invention as claimed.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

In a heating apparatus, the furnace A and chimney E, in combination with the connecting-pipe D, intermediate chamber, F, having openings, ff, damper G, and pipe H, connecting the top of the chamber F with the ash-pit, as set forth.

In witness whereof I hereunto set my hand.

WILLIAM HENRY RICHARDSON.

Witnesses:

DEAN CLARKE, OL. B. DE LIPTAY. 

